Keyboard



FIG. 1 is a perspective view of a keyboard, showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left view thereof.

FIG. 5 is a right view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the figures illustrate portions that form no part of claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 